Bionomics of Rhagoletis pomonella1 in Crataegus2

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Abstract
Crataegus holmesiana, which produces fruits ripening with mid-season apple cultivars, was the primary hawthorn host of Rhagoletis pomonella in areas surveyed in western New York. The peak emergence of flies reared in this host occurred in late July, ca. 2 wk later than that of flies which infested apples. Peak captures in hawthorn trees occurred during the 1st wk in Aug. Reciprocal crosses of flies originating from apples and hawthorn produced equally viable eggs in the laboratory. Hawthorn fruits sampled in Aug. frequently contained more than one egg. In laboratory tests, flies preferred to oviposit in freshly picked apples rather than in hawthorn fruit until the last wk in Aug., regardless of their host origin. Thereafter, both groups of flies preferred to oviposit in hawthorn fruit. Field studies also indicated that flies associated with the 2 hosts would oviposit in both fruits if they were available. R. pomonella infesting C. holmesiana fruits may be potential pests of commercial apple orchards in New York because of their seasonal activity and oviposition

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